11511 - Frieze Patterns/frieze.cpp

   1 #include<iostream>
   2 #include<cstdio>
   3 #include<vector>
   4 using namespace std;
   5
   6 int f[1005][1005];
   7
   8 int main(){
   9   int n, row, col;
  10   while (cin >> n >> row >> col && n){
  11     for (int i=0; i<n; ++i) cin >> f[i][0];
  12     for (int j=0; j<(n+1); ++j) f[0][j] = f[n-1][j] = 1;
  13     for (int j=1; j<(n+1); ++j)
  14       for (int i=1; i<n-1; ++i)
  15         f[i][j] = (f[i+1][j-1]*f[i-1][j]+1)/f[i][j-1];
  16
  17     --row, --col;
  18     cout << f[row][col%(n+1)] << endl;
  19   }
  20   return 0;
  21 }